Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5017ead715fa14fc98796ddfe2b434571f15ed6e0f9d4b052eec7c08ad15d80a' 
  AND token = 'QradbCjurp26xoN+8BHCO+gAu3bcLDsyoOZUFn1iH38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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