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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b3be55608e1412d5d2f1358f941d1ca79838ae4b9b3d6097471cd99d7041f9ca' 
  AND token = '9bRkm09PCNcgtORx26kxW5KjMxovZWIEShsf+RY170E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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