Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e09d085ed758e0a5d0acb3e877f3c5e1bbb2c741abb7bc8843631a42670fadd6' 
  AND token = 'wpkyZYAY1yQMzFCjUd60SOeq2pOkgtWg3Ldqv/GN6mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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