Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0b85268ad28ca0e9eca18f8a0f15f54ca1702615546e4ac4edca73182b85a5c' 
  AND token = 'pV5pBnmrPjah6w8AfFqFfrPbVCMtbh6cuuw/q2gXAlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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