Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f82c0a416fd618cce8581e487adc1bde606312462658a89d0833bd3a1886316' 
  AND token = 'szIxAMStjBCbj9T51U5tkUWBom5E+3fUzUjqodpT1DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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