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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '398ca98e091c5c1279f4a8f08ba5d7411af3ca12a5018089c2e922d936ef1998' 
  AND token = 'p8LC10SO6pt7FwjrQQO8q9YgVfhgmxtSLB18Xl1OF20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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