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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f9875b07bdd07117d0fa6e433587d4612831e833e865133960c444c51dd80f21' 
  AND token = 'aW2gTz9cPbSNysFPs08nkBZrO+xCuKcBUzb7iyG45Ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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