Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9be1bb42b067b6817a27d53ec4c6dc25ecc7d0bc9f3ebfd88a1221c443d2b43' 
  AND token = '95IjLL3VeIBfKUEb7MrJexR52xfaaNC8ayvZFdK2ztI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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