Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c647d643cfdaab3c143d10387b3efbb51426f3c99a846265187142141497dbf' 
  AND token = 'x/dzb81/d25rlANk8yarxkVQGHyVEMjEdxh7BjDeLDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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