Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f191cbf7926b4e4eb715e97a2f6fee6225aeb50352d9af1bc1a98a233b7eccf' 
  AND token = 'ljyGHeMpBb1kvc2L0iTWn+FsRxuPDqMh1EGF7AWeTZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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