Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d4c83c134019c3d33af5c97d42fd90f97b041cc31585ade120d1daed454f03c' 
  AND token = 't2F1Uv60p+4CM4SQIuI+IkfVQG3Va/3xLix58PipMa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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