SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e095759271b78d67ac1d1cdf9a3b10382fe05ee6c0fbb816d0f504d74d4ba30a' 
  AND token = 'C30NQfdLF0NqBukNXIFfh+OkcfAYHwmJ/CRyIpUw8w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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