Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbcdb87a8cea279e653202bf8590c2aef4d8d1b8db37310699e007342ee5c790' 
  AND token = 'xx/GMMj/tY6HWYoEvDP9M/fdXxxsuLq0y2SV/0eDlwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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