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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '8f0ff0891c9d286906b82f11e41667439d8fbb5b0a90ed4494bce4a276fcbb35' 
  AND token = '7mXuliaF59sWxc/9s3mMbFmNOfDshOCpjk1ejfQn1Jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}