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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bd9dd66ab3f088b7e54cddb0d9121215044e3efca5326013bb807c0351793d31' 
  AND token = 'Oe3iO1JTBg4VVGU6AjdxqTzFzsdgI/Xqn3M8EBb/hb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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