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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '714f4bbf989b2ddbd1830c3fea1379a8a5a003d7187cce3923857b164ecc98fd' 
  AND token = 'XfZHp0f58nMr4GmnV14f9uK9QRqix4lUX+IwnJea9Hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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