Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b45f466848ddce19820fdc299a16afff5a049e7a6c4cb84ffa6d73747af78f0e' 
  AND token = 'OWpiyrgeHZwgoPVzwzRi2cApIXzLb7Nmhdvn0lS+sRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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