SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c68ddb4422a76e90b417a16850f6b91296b665f378166e0ab4c7b134d50d473d' 
  AND token = 'NmY/MgOCy+WGTZ7RM0jIKQFQtPGVq/s7YZCiQrblXqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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