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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9c161add488f495c4ea0557f0406b52d627ee7d9cedf8069c5963e2b0293c084' 
  AND token = '3se4etKwQPDiqtAwj9f3tX4U3Db4ver/VnHeo5s3cig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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