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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6f40ed563f2344ec4bb13f2c108ac683c1a4fb85ac3679a5a4b4b0bdd77bc588' 
  AND token = '4vTK6US7mdWkFv90ohtBymUYYeeVMC/U142xu3OQyAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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