Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c55c1f5c6b611b9b73fde0a8491cf3c8d9fb00303c33102c6b227686b47b21a' 
  AND token = 'QLoKJaP3s9KjhenFEFtNLDDzudCO3HEsD4XzkAnUCVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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