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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c17097356c0c55b479a7f0877b9907e6a0a4067760c9b4385bcaac6da4d257ed' 
  AND token = '7cErF3Ya6URTJS+GD3KeSZqu3l2ObDFLwpXaEQRbxwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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