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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6ef017f9a72f5614de0aa8f02300ea0732307223f391389693519a008cbc2c51' 
  AND token = 'hBgiCcL3a7BNMim17N/64pwmT9KOiBPk+75UMgn+sbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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