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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '804b421eaad9e732cc736fc2e5aeb95f6f01f685d7aaa0760b0a126d1ec5a92b' 
  AND token = 'dDcZ5+/Pg65Ehg0+HaaOgatH0De49yPXpsT6ZpxsXaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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