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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd0136923b4e49f949c153c940322552336b9b92ebbcbc5a8f5e1d5b04be819d4' 
  AND token = 'n85FboBAHJuUqO0lf1r8/VpXY4iSaCik8FNzhccf3Qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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