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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b58fc5ec3af9938235f348b139859be60cd725188ec7319397f8d517493715b1' 
  AND token = '22ZhkPbnMGse/NwR7g+cUZllcb02HjU0GYJloE/7NdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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