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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '6295420adbec8a8c17798511b0807423541e0033b8aeb76cb2de88d3e9a4baa9' 
  AND token = '8sHSwLxYPz/4ppvoHA0JCebtmNvYod55xCZMSK/5Rbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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