Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d3a7e47a3d1553f532394fcae42374ee4eeca5c3acdc8af47ac01b771d59c75' 
  AND token = 'UC0zV3PG/SHCovXu7e44RginWvySB7eWoBVURvaxmcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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