SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '629fc62f5fb14787be1c5977086bd5bc4cd280d6326f71a9a2d97b5050b0aeaa' 
  AND token = '+H2HgdsTwQ8OBvEJmig4942xVnJZYxz0y5/tI5fpxu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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