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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bb91462b03808c4dc30b5b0d2e006d6c324cdf678a62deaf1bb5a8110b161c89' 
  AND token = 'nQy7TfHKFLVtbh3k6QwfYCVH0fXdbyyNYS1Ok4EgM4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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