Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '644515ba241de39c0b2aabc8f39815c3fcf3a0d91e4471d51b1960c21d52397d' 
  AND token = '1qEJdgtZJEwyXurwoJN1hjbBpc4y95r53lEH6axABlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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