SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e8d17c0557fbb79745dcffdf69e57d42566bec116896794584b0e80248ee0d0e' 
  AND token = 'GhVYc8m+luO3nSXNft0z2eqvdKiRKww+Zkfbg6BLAb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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