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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6bfb8ca29e661a4e3cd34b62ba5be84faae70c2d4aa31be9665bd1be9bf6f618' 
  AND token = '11dwa6xgXOY17Ct7VZjlrQOEJ5sXf9wk/ymfuJvFjqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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