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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd9e358885b6bc142e29f5a737dec39c8fa449c68bb02089036ef64a21eddc0e4' 
  AND token = 'w8WfxMIN5Aw6/nyV6O4brfIa0bzLFYHGn6mtvanv/zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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