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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fc814ccd3a6c1ade04369a3320846d31519255b9c502f655c10e4ee8d3a3a20d' 
  AND token = 'AHbpJjhImfcvSQz2FwpBZorc4L4IgAJwsY1dQAugt7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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