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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6d97c7c1de8d1cfdaba1ea72a227323342aee803e55d6e02172818d9c325d57b' 
  AND token = '1ge6M8vQin/AomSW/f1Kbnd/s2NmTPP6tw0mAHpuE/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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