SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'faa7cda404daf7636eb3b6912bbdef04b4d8037ab59079b39305f055419424ed' 
  AND token = 'NUxN3g9418h+VxJeDqjGizEhieCLBNOG5QBKdTQFoKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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