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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e1453e2738130c871db53fa572e7c8f138bd7fa5c74d488dbc85c7532fc18044' 
  AND token = 'ToYLl03XWGoGQpiPilDEy+qmWxkm6XfJr6O7k0UI8BQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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