Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39e80261d7708345d15db2da16c6dfac2e5f5697448138ef2202a7376ab7eb82' 
  AND token = 'YmMX/3n69pJJk0o0IGlDscHtbCVif2I7KXUAoJPpfgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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