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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '771bb8c3c5d2762cc07d73893bded182ff5490469a63c245ea18b658f0c7ff48' 
  AND token = 'y8vcs7yUEs9AsV4GdncTt/PkLGIzirVlDxpJrc6wTu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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