Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88bd538b192403532d33000ac0ad0c038f06dcdd5a6ba21377d522719e878142' 
  AND token = '9VMkdmbOzbI9K6+muDFbr38NCdbWk4jjQTYfYQdRiQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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