Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2110ee6ee38ee2e45c7e9fab1ca3a8ea5008bea84b25e430a23735d49fbc58c' 
  AND token = 'nSHTqpulBzc5/Xs7Z7wgAUZvfh8uVZ+uIa9UH14CU8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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