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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1d0a0c25ff5e70464c8b91cbf2a480d5190a14ab06086cab7f69f561ba1a3671' 
  AND token = 'A7SFRnxG4EWusc00SK0H/ENeay9SQ8L4SCflwjI522Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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