Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f4b0c5ec246559fef36d9c5215c3736d2c338034150aaf817ba825bb5120b42' 
  AND token = '+iUvyd4CRnnHu/+jyGYbaYbzcIUQfapVHfItSXLMVIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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