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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '050b353c43553906fb49d52d86385e2326b233d0e1b2edab5f556d2eb7149146' 
  AND token = 'lVIL3nmuhIwYN7G29BsgvB8cQHHC3KSonnSYc05soe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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