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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '843d92c0c2336c27ed7765e067b08aa4cb277f312b0891dd43d326b34785b2b7' 
  AND token = 'gVXOl1ZOebiXb/nQyr7//4HEYcVljSjFl1i7Q9ST7yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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