Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c83a019b6bbf59d38f10d89013aff46fa6ee8be87e240ae41a9a1039e43404b' 
  AND token = '7JQmjaW3o+TWEN9O0FrLE4BjIcaQ+2EdKN3gRGm0gCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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