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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '85436ba1b64a9ff473c212fca388a0c8c9dd7b80ba4871c5fb594aac93ecc864' 
  AND token = 'RLEJQMIFLoJsOezfPFvbKSOR9YT42kiyEtAIDEj1Gfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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