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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '405dc60976fac7136ad2b7e46ffdef54325355ad7477e67f01a8e74e245fb4ec' 
  AND token = 'GIvPi1WFLGyT8GqvBWuhDu6voc5a17P6iDFm6cddd1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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