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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cb50bb231b166af2fcbb4b614ea1c8195c7c6c4b95b6407cbb963d6212afad9c' 
  AND token = 'zd8yZDPvpiB5xmYjeK6b/1dni4Yaoz76A4pzlMhEBwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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