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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5ac1e60a3771fbf93f2e51902b7b14077ba0fc994d49da1330f9b3e9d6831703' 
  AND token = 'Fp63DSQJDrUeOQoM/e3iFrhn+wJTPyMymiJmPbq6yT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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