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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'f3090f45c648cd235b7286558929acf10e5ec5365d0f134b5c6098bf5589e32c' 
  AND token = 'f7vxsrLzxyAEUaOBFjrSKXtFUcN7PJEAHGQ0oBxDR/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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