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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '00121fe367c925d0eefc02ce570948f03744cc58c2177e1404f5b80a2a71cb03' 
  AND token = 'X8vJtGP7IRW/3eTvuknWs3+JAtRirKgXU+BpSTNeJ7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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