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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '64c865c098b981e31a9c48b64fed0e9c7f20361afa2d2edd6a63c0f6b6f0ed81' 
  AND token = 'ob+eGWDV6aLOBpR7IVd45LjKx12QRbXVXECPlNV300U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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