Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4b3254d2ba7ffe6047c6ad5bd3ad8d3e500acd1af8e50e89e7f07c6179a74bc' 
  AND token = 'JiaRKG3eTd0kG7OkZPclZC3HDcNUJtww579gms1U8T4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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