Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50ee518c4fad399ba07739364874dddc77b7d12e1cf762d644c2e796fa295b04' 
  AND token = 'vouks6SLNu0t/PWl25Pjh/1SLBAk22959PTdgyRLP7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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