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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2c6fddc7fda9a3ffc8acbef31ff8e90536ba2336d5dc8a7eda0de6c6456ac949' 
  AND token = 'Zmp2V6hoxFcT5BmV+K1tEIBpXPPksNS9kCui4PsEci8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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