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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4abc385e4b4c7e019ece41b50a7f60e100f09087491f17e7fbd5215ddc8f86d7' 
  AND token = 'mNBF+r+m4D7z9WzW7oCssJRzfDaQ/dzq6DY33v4yx+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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