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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '860a71c34aaead1187bc681faeb89a9fef73eaa2412bbf49c6837490e3a94268' 
  AND token = 'nPxJ34o2BfqErt37Pvmg7IJBrUNckOQn4RGYVhWfX1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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