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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fc8e37702bddb47a4d9d51fa8eb7fad025c03f8864181fadb8cc7b85979c9b7b' 
  AND token = '2YEuzJ5Ywz/wS8HPnujeSvAkzmz+eaUUk3kx1t7lSlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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