SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fc0a6529171de33140a4d5c3d44743668965372d285a3994d0fd96fd9674a8f5' 
  AND token = 'X6jW3OgTbCdt+Kxl/vv/pbFhUCbc0YP+glHhctiY3HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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