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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '643ca889b233fe10b1034c41ce90d41ddfba5e88d8d65032f80af0beaa07eeb5' 
  AND token = 'Y2cZIIjJTs+e5/1GYw/X9lOf5K1AXuwlvJ4pQVQeaa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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