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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '99aedcb6954f0b80145cd68991941a987b06338e41203a2d616879dc95f709df' 
  AND token = 'IsFFou9uMvHbI18uMoOqQK/3+OVBqOaP4O1Iv6IZxjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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