SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fae80c4c33a47d8eb659f354eba98b512c650177ad04d64ab63fb3cf26c693f8' 
  AND token = 'myc2Tjwno/Gelv0vGzqpYRRoF+Js62WyO5VHAVseLxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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