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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3cb14790a8697d8e628efd651f12b30b36a502869e46ab71a2d74d247cd986cf' 
  AND token = 'tEej2kteTck9ozATanJUyQqUcF1kTgDvzGhax0uj/Eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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