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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ced00b54d78a65d4dd1f5738112da727da6c1537644dfc331de68450d678e9f6' 
  AND token = 'sAeoer2FBxVDJaCdBUKkswl6PA0G7pIC8Oh8gRGAtNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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