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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a3ae2f597a462243a89be2a7757fad2e044cfa28ce237cfb2bdbc76403e26458' 
  AND token = 'RbT1zXf6p6H/NYYsHJLW4V7D6DIOIjK79O7lt/1uqSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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