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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f06710ec22aeb1633cb41307ed0a42d9d8ce3f2429366d040594a6e3d2e8205f' 
  AND token = '7rtQdx7L4CddbMgtg8vXEcsN0ez0MHAte0YQ7G9LbZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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