Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3f91c5a7db63dbcfa3c7333f1cdebb8331a7e2d7da877894ddb9987d106e42c' 
  AND token = 'eD6PGfzJvWett1hajmv53uru6ejT4ssUuu1/Hn89+fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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