SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '72ac97a94d48c26d411b12f2e927bcff0b991afb9daa97951d3773f1be335f9c' 
  AND token = '9p6hbZIU0HZBRHiAM8y22/qjEbZQ6+XGUK9wKhcm4d4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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