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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd659e1c619a32e34304e5c526eb56e99573654a564578e3566258e40c4c36227' 
  AND token = 'B3H/EiX0QtXA+YhgpXYCYs/bQVTbxKwAWi5Y8z+6d74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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