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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7fc6eaec1f970723be84618c7e96e660a5d4cbcb855e83ff4a539c6792fd9fce' 
  AND token = 'PrieNkmxF3DlXN5eEnLMF/pu+rcKjIVv7uKtbiQn1Ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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